Grooves in the squish area of the combustion chamber

[lovemysan]

http://www.jeremiahsviolins.com/grooves.htm

Anyone done this?

I'm curious. I would love to do this but my car is too nice.

[SVOboy]

Ah, I posted about this way back when when it was new, who knows, not me. Someone more clever will have to come along and see. I believe Larry is having this done on his saturn.

However, it might be worth noting that Hondas don't really have quench spaces, at least not D, B, H, or F series Hondas. I haven't seen a K or L taken apart that I know of but I don't they changed their basic head casting.

[MetroMPG]

This person is a regular contributor at teamswift in the FE forum. I haven't talked to him about this though. What's the supposed mechanism that helps FE?

He mentions the grooves helped reduce ping, which he got by going with a shaved head / increased compression ratio. But, isn't taking material out of the combustion chamber simply reducing the compression ratio again?

I admit this one's beyond me.

[Ryland]

the idea of the grooves I think is they help to chanal the flame to the outer edges to help with a faster more compleat burn, and altho the groves will help to reduce compression I doubt, unless he bearly touched the head when he shaved it, that those tiny notches have no way of making up that much volume.

[Matt Timion]

I can idle it while driving in 2nd gear below 500 rpm

How does one idle while in 2nd gear?

[Matt Timion]

So I guess I'd like to see a better test before I get out the grinder and carbide bit.

You're more adverterous than I. I'd prefer to have a spare cylinder head before I did this one.

[SVOboy]

Dude, I'd throw a few bucks your way just to have a reliable test done on this ish.

[ZugyNA]

I've already started to go nuts with porting, valve relieving, and chamber cc'ing. Would consider these if there was a better basis for doing so.

Check out www.mpgresearch.com

...you can also find links to other sites...a lot of people doing the groove thing with some good results.

[chesspirate]

Dude, I'd throw a few bucks your way just to have a reliable test done on this ish.
well, how much is a few? because i would love to see a real test done just to have a REAL test done. if a handfull of us pitched in $20each, and a junkyard run ensued??

[Matt Timion]

well, how much is a few? because i would love to see a real test done just to have a REAL test done. if a handfull of us pitched in $20each, and a junkyard run ensued??

For something like this, I think it would be better to use a junk car on it's way out. I believe I remember reading about certain auto manufacturers trying to do this on their engines, but they found it was too difficult to do correctly, so they abandoned the modification.

[SVOboy]

I'd throw 20 bucks at it. Hell, if hondas had quench space I would've done this a while back. Mehbe this is something I can try on my possible geo metro before I dump the diesel in there, :p

[Kraig]

I thought a combustion chamber used the "quench" area to control detonation. I would think grinding a groove to allow the flame front to travel into the quench area would be detrimental to the control of detonation. Or would these channels allow gases caught in the quench area to be forced back into the center of the chamber and create more turbulence (swirl) for a more complete burn?